(1B) The product $(a+b)(c+d)$
Practice
Expand and simplify.
*Write your answers with powers of $x$ in descending order. $\left(\square x^2 \pm \square x \pm \square\right)$
$\left(x-9\right)\left(x-2\right)$
$\left(x-2\right)\left(x+3\right)$
$\left(x-2\right)\left(5-x\right)$
$\left(x+2\right)\left(4-x\right)$
$\left(2+x\right)\left(x-3\right)$
$\left(7+x\right)\left(x-9\right)$
$\left(6+x\right)\left(9-x\right)$
$\left(-3+x\right)\left(5-x\right)$
$\left(x-8\right)\left(x-6\right)$
$\left(-3x+1\right)\left(5x-9\right)$
$\left(-5x+3\right)\left(-8+x\right)$
$\left(5x+4\right)\left(2+7x\right)$
$\left(-8+x\right)\left(5x-2\right)$
$\left(7+4x\right)\left(6x-1\right)$
$\left(2+x\right)\left(1-3x\right)$
$\left(2+x\right)\left(-2+7x\right)$